Thread: Decimal to Binary

I'm trying to pass a decimal number to a function and convert it to binary and return it and print it out in main. But it prints out 1011 and then seg faults...not sure where it's tripping up

Code:

int main(){
  char* binNum = decToBin(25);
  int i = 0;

  while(binNum != NULL){
    printf("%c", *(binNum+i));
    i++;
  }
}
 
 
char* decToBin(int dec){
    char* output = malloc(20*sizeof(char));
    int i = 0;
    while(dec > 0){
        if(dec % 2){
            output[i] += '1';
        }
        else{
            output[i] += '0';
        }
        dec /= 2;
        i++;
    }
    return output;
}